package com.example.myapplication5;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity
{
    SharedPreferences preferences;
    SharedPreferences.Editor editor;
    Button b1;
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        b1 = findViewById(R.id.bn1);
        b1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this,Main2Activity.class);
                startActivity(intent);
            }


        });


        preferences = getSharedPreferences("count"
                , MODE_PRIVATE);
        // 读取SharedPreferences里的count数据
        int count = preferences.getInt("count", 0);
        // 显示程序以前使用的次数
        Toast.makeText(this, "程序以前被使用了" + count + "次。"
                , Toast.LENGTH_LONG).show();
        editor = preferences.edit();
        // 存入数据
        editor.putInt("count", ++count);
        // 提交修改
        editor.commit();

    }
}
